Ответ:

1. If he had eaten (eat) everything he would have been (be) ill (3)

2. The police will arrest (arrest) him if they catch (catch) him (1)

3.If she needs a radio she will borrow mine.

4. If he goes on telling lies nobody believes a word.

5.. If you come late they will not let you in.

6. She won't open the door, unless she knows who it is

126.

1.If he works hard today can he have a holiday tomorrow.

2. Ice will turn the water if you heat it.

3. If I tell you a secret, will you promise not to tell it to anyone else?

4. If he likes the house will he buy it?

5. Tell him to ring me up if you see him.

6. . If he had been late we'll go without him .